static function noop(_) {}

<let/a=0/>
<let/b=0/>
<let/c={}/>
<let/d=0/>
<let/e=[]/>
<button onClick() {
  let local;
  ({
    a,
    _b: { _b: b },
    local,
    ...c
  } = { a: 1, _b: { _b: 2 }, local: 3, c: 4 });
  noop([
    {
      arr: [local, d, , ...e],
    },
  ] = [{ arr: [6, 7, 8, 9] }]);
}>
  <pre>a    1    ${a}</pre>
  <pre>b    2    ${b}</pre>
  <pre>c  {c:4}  ${JSON.stringify(d)}</pre>
  <pre>d    7    ${d}</pre>
  <pre>f   [9]   ${JSON.stringify(e)}</pre>
</button>
